Subcarrier allocation based compensation for carrier frequency offset and I/Q imbalances in OFDM systems

Authors:
Hai Lin;Katsumi Yamashita
Affiliations:
Department of Electrical and Information Systems, Osaka Prefecture University, Osaka, Japan;Department of Electrical and Information Systems, Osaka Prefecture University, Osaka, Japan
Venue:
IEEE Transactions on Wireless Communications
Year:
2009

Citing 7
Cited 0

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Abstract

We propose a novel subcarrier allocation (SCA) based approach for compensating carrier frequency offset (CFO) and I/Q imbalances in direct-conversion OFDM receivers. From the matrix representation of OFDM signals with CFO and I/Q imbalances, maximum likelihood CFO estimation and the associated SCA are given. Then, an SCA-based algorithm is proposed for the I/Q imbalances compensation. Moreover, the proposed approach is extended to a blind compensation scheme for OFDM signals with asymmetric SCA.